Borg Transmissions carry a large and comprehensive stock of orings, in a wide range of materials.

 

Orings are the most versatile and economical form of seal in use today and are accepted by engineers as an essential item in hydraulic and pneumatic equipment.

Simple in shape, requiring limited space for installation and yet easily stretched for assembly.

However to take full advantage of an oring seal it is important to select the correct size and material. Our experienced team is available to assist you in your selection.

 

Orings and Oring Cord

 

 

O rings are the most versatile and economical form of seal in use today and are accepted by engineers as an essential item in hydraulic and pneumatic equipment.

Simple in shape, requiring limited space for installation and yet easily stretched for assembly.

However to take full advantage of an o ring seal it is important to select the correct size and material. Our experienced team is available to assist you in your selection.

 

Ethylene Propylene Rubber (EPDM)

 

A copolymer of ethylene and propylene having excellent resistance to weathering and ozone, water and steam, with good performance in castor and some phosphate ester based fluids. Its low and high temperature capability is good.

EPDM is particularly good at sealing boiling water and steam, now used in the majority of central heating systems replacing the out dated gland materials.

It should never be used in contact with mineral based fluids or di-ester based lubricants, due to excess swell and deterioration.

 

Viton (FPM) Fluorocarbon Rubber

 

It is a copolymer of vinylidene fluoride and hexafluropropylene. This is the second most popular polymer in use. This popularity is due to its excellent high temperature capability, excellent resistance to hydraulic oils, petrols and many chemicals, including weathering and ozone conditions.

Its main disadvantage is in the area of low temperature, being limited to -15 deg C. Certain grades of Viton can accommodate low temperatures but at increased cost.

 

Silicone Rubber (SIL)

 

Silicones have poor tensile strength, poor tear and abrasion resistance, high permeation of gases and poor resistance to mineral fluids. Its main advantage is that it can be used in extremes of temperature and its chemical weathering resistance is excellent.

It is widely used in the medical and food production field due to its non-toxicity.

 

Fluorosilicone Rubber

 

Silicone rubber can be chemically modified to “Fluorosilicone”, giving it reasonable oil and fuel resistance combined with high and low temperature capabilities.

Fluorosilicone has similar disadvantages in poor strength etc. whilst it is also extremely expensive consequently it use is limited to specialised fields such as aerospace.

 

Perfluoroelastomer (FFKM) Kalrez

 

Kalrez is considered the very best polymer used for oring material.

It resists over 1800 different chemicals while offering the high temperature stability of PTFE (327 deg C). Advanced properties help maintain seal integrity.

Kalrez is used in highly aggressive chemical processing, semiconductor wafer processing, pharmaceutical, oil and gas recovery, aerospace and petroleum applications

However Kalrez is extremely expensive so consequently is only used when really required.